New York, New York, United States
As a Senior Scientist and Senior Instructional Designer with a Ph.D. in Mathematics Education, I specialize in technology’s role in shaping mathematical thinking and learning. With extensive experience in education research, software development, and professional development, I bring to my work expertise in pedagogy, curriculum design, and digital tools that foster student engagement and understanding. 🔹 EdTech Leadership & Research: I co-directed two NSF-funded mathematics education grants: the $2.5M Dynamic Number project and the $300K Forging Mathematical Connections protect. Both grants investigated how innovative dynamic mathematics software can enhance conceptual learning. 🔹 A.I. Skills: Using Claude, I am authoring an ever-growing collection of innovative mathematical microworlds and puzzles that demonstrate the power of A.I., paired with skilled human guidance, to create high-quality digital learning materials. 🔹 Software Development: I have played a central role in developing award-winning commercial mathematics software, including The Geometer's Sketchpad and Web Sketchpad, working cross functionality with engineers to design tools that transform the way students and educators interact with mathematical ideas. 🔹 Thought Leadership & Impact: As an author, conference speaker, and professional development leader, I publish widely on mathematics education and blog at sineofthetimes.org. I have presented at more than 40 conferences in the past 20 years. I have also taught geometry at NYU and City College, mentoring the next generation of math educators. 🔹Author: My latest book, Explore Mathematics with Origami, will be published by Tarquin in 2026, merging hands-on learning with mathematical exploration. I have authored five mathematics texts and am skilled at presenting complex ideas clearly. I am eager to discuss opportunities for full-time leadership roles, collaborations, and consulting opportunities at the intersection of mathematics education, technology, and learning innovation.
• Lead designer and product owner of Web Sketchpad, the online successor to The Geometer's Sketchpad. Direct two software contractors, set product vision, and lead the iterative cycle of design, classroom field-testing, and continuous refinement. • Author and editor of hundreds of K–12 interactive math activities for Everyday Mathematics, Illustrative Mathematics, Reveal Mathematics, and Key Curriculum Press. Ensure instructional materials are evidence-aligned, classroom-tested, standards based, and meet the needs of teachers and students in classrooms. • Collaborate across product, design, and engineering teams to ensure that instructional intent is faithfully realized in digital tools, with attention to usability, implementation, accessibility, and teacher supports.
Adjunct professor of graduate-level geometry course for teachers (Fall 2023 and Fall 2025)
Co-Principal Investigator of the $300,000 IUSE-funded project, Technology-Rich Units for Future Secondary Teachers: Forging Mathematical Connections Through the Geometry of Functions. Oversaw the development of curriculum units for pre-service teachers that capitalized on innovative technology to deepen teachers' understanding of the connections between geometric transformations and algebraic functions.
Adjunct professor of graduate-level geometry course for teachers at NYU's Steinhardt School of Education (1998–2003 and Winter 2017)
Co-Principal Investigator of the $2.5 million National Science Foundation-funded DRK-12 project, Introducing Dynamic Number as a Transformative Technology for Number and Early Algebra. This project extended the paradigm of Dynamic Geometry with a new technological paradigm, Dynamic Number, centered on the direct manipulation of numerical representations and constructions for grades 2–8. The project supported the development of Sketchpad Explorer for the iPad and Web Sketchpad.